How to resolve bug RC4 encrypt-decrypt on iPAD with AIR15 only

Hi everybody,

I have some trouble with AIR15 only, In the past, I created a small game on iPad It could send or receive messge from server. I used lib as3crypto.swc encrypt or decrypt message (RC4). But when I upgrade to AIR15 encrypt-decrypt cannot work ( Another thing about this crash is that it only happens with a release (adhoc or appstore) build but NOT with a debug build). I check so many time but i don't know what is problem here.

Please help me, thanks so much any advice.

P/S: My game have many swf files (code and resource). I must combine multiple SWF files into one.

Class RC4.as

import com.hurlant.crypto.prng.ARC4;

import com.hurlant.util.Base64;

import com.hurlant.util.Hex;

import flash.utils.ByteArray;

public class RC4

{

  private static const key:String = "keytest";

  private static var byteKeys:ByteArray = Hex.toArray(Hex.fromString(key));

  private static var rc4:ARC4 = new ARC4();

  public static function encrypt(clearText:String):String

{

  var byteText:ByteArray = Hex.toArray(Hex.fromString(clearText));

  rc4.init(byteKeys);

  rc4.encrypt(byteText);

  return Base64.encodeByteArray(byteText);

}

public static function decrypt(encryptedText:String):String

{

  var byteText:ByteArray = Base64.decodeToByteArray(encryptedText);

  rc4.init(byteKeys);

  rc4.decrypt(byteText);

  return Hex.toString(Hex.fromArray(byteText));

}

}